Well, as i said, Tholal's More Naval AI is the way to go if you want something stable and close to the original experience.
Rise of Erebus and its offshoots added more stuff but should be stable enough in terms of OOS.
and i do not know about Master of Mana's OOS stability, but it's, i think, the one that has the least in common with FFH. Apart from that, Orbis doesn't have any living dev branch anymore but was pretty stable at the time.